20010021221021 has 8 divisors (see below), whose sum is σ = 21549292340184. Its totient is φ = 18470755632960.

The previous prime is 20010021220949. The next prime is 20010021221033. The reversal of 20010021221021 is 12012212001002.

It can be written as a sum of positive squares in 4 ways, for example, as 1059017995396 + 18951003225625 = 1029086^2 + 4353275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20010021221021 - 2¹⁰ = 20010021219997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010021220987 and 20010021221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010021226021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9041675 + ... + 11035031.

It is an arithmetic number, because the mean of its divisors is an integer number (2693661542523).

Almost surely, 2^{20010021221021} is an apocalyptic number.

It is an amenable number.

20010021221021 is a deficient number, since it is larger than the sum of its proper divisors (1539271119163).

20010021221021 is a wasteful number, since it uses less digits than its factorization.

20010021221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765551.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20010021221021 its reverse (12012212001002), we get a palindrome (32022233222023).

The spelling of 20010021221021 in words is "twenty trillion, ten billion, twenty-one million, two hundred twenty-one thousand, twenty-one".